update grpc golang poc formula

.gitmodules

@@ -1,6 +1,4 @@
-[submodule "grpc/golang/poc/proto"]
-	path = grpc/golang/poc/proto
-	url = https://github.com/GuillaumeFalourd/poc-proto.git
+
 [submodule "grpc/golang/poc/protos"]
 	path = grpc/golang/poc/protos
 	url = https://github.com/GuillaumeFalourd/poc-proto.git

grpc/golang/poc/README.md

@@ -25,14 +25,32 @@ rit grpc golang poc
 
 ![Formula](https://user-images.githubusercontent.com/22433243/128401370-a2ba5cd3-d92f-4c44-9950-c67baac24ff5.png)
 
+* * *
+
 ## How does it work?
 
 Reference: [Go generated code](https://developers.google.com/protocol-buffers/docs/reference/go-generated#package)
 
 1 - The `protos` submodules as been added at the formula `root` repository based on [this Github repository](https://github.com/GuillaumeFalourd/poc-proto).
 
+- To add a submodule: _e.g `git submodule add https://github.com/GuillaumeFalourd/poc-proto.git protos`_
+- To update a submodule: _e.g `git submodule update --remote --recursive`_
+- To init a submodule after a clone: _e.g `git submodule init` then `git submodule update`_
+
 2 - To generate files from the `protos/user/user.proto` file, use the `make gen-go-proto` at the formula root directory (here `grpc/golang/poc`).
 
+_Add a method like this to the Makefile:_
+
+```shell
+gen-go-proto:
+	mkdir -p src/pkg/formula
+	protoc --go_out=src/pkg/formula \
+		--go_opt=paths=source_relative \
+		--go-grpc_out=src/pkg/formula \
+		--go-grpc_opt=paths=source_relative \
+		protos/user/user.proto
+```
+
 _Note that the proto file currently needs to have a `go_package` informed to work._
 
 3 - Files will be generated inside the `./poc/src/pkg/formula` folder on a new `protos/user` directory.
@@ -41,6 +59,8 @@ _Note that the proto file currently needs to have a `go_package` informed to wor
 
 5 - Then, implement the formula to call the gRPC service you wish.
 
+* * *
+
 _**Note**: If the `user.proto` is updated from the remote repository. You can update it on the formula using the followigin command_
 
 ```bash

grpc/golang/poc/src/pkg/formula/formula.go

@@ -24,18 +24,17 @@ type Formula struct {
 }
 
 func (f Formula) Run() {
-
 	// Set up a connection to the server.
-	conn, err := grpc.Dial(address, grpc.WithInsecure(), grpc.WithBlock())
+	ctx, cancel := context.WithTimeout(context.Background(), 5000*time.Millisecond) // 5000 Millisecond is the timeout allowed
+	conn, err := grpc.DialContext(ctx, address, grpc.WithInsecure(), grpc.WithBlock())
 	if err != nil {
-		log.Fatalf("did not connect: %v", err)
+		log.Fatalf("Couldn't connect: %v", err)
 	}
 	defer conn.Close()
 	c := pb.NewUserClient(conn)
+	defer cancel()
 
 	// Call server Login method through gRPC.
-	ctx, cancel := context.WithTimeout(context.Background(), time.Second)
-	defer cancel()
 	r, err := c.Login(ctx, &pb.LoginRequest{Username: f.Username, Password: f.Password})
 	if err != nil {
 		log.Fatalf("Unexpected Error: %v", err)